Shuttle-spring.



W. A. BSHAW.

SHUTTLE SPRING.

APPLICATION man mm' 25, 1917..

' inner faces to receive the butt rings of thel SHUTTLE-SPRING.

narines.

Slpeocaton of Letters Patenti. l' Patented 25, 1917.

Application med May 25,1917. Serial No. 170,992.

To all whom it may concern n Be it known that I, VILLIAM A. BAsHAw, a citizen of the United States, residing at Winkinsonville, in the county of Worcester and State of Massachusetts, have invented a new and useful Shuttle-Spring, of which the following is a specification.

This invention relates to a shuttle spring designed to hold a weft carrier or bobbin in the shuttle of an automatic loom.

Such springs are provided with a pair of weft carrier holding jaws grooved on their weft carriers or bobbins. Springs of this general type have been previously made in many different ways, but have been subject to certain objections either for lack of durability or on accountof the expense of manufacture. i

1t is the general object of my present invention to provide an improved shuttle spring of this type in which the cost of manufacture is reduced and the durability and utility of the spring correspondingly increased.

To this end, my invention consists of the improved scribed, and also of the improved process of manufacture thereof. p

The preferred form of my invention is shown in the drawings, in whichi Figure 1 is a top plan view of a shuttle with my improved shuttle spring mounted therein;

Fig'. 2 is a perspective view of ythe blank from which my improved spring is formed;

Fig. 8 is a perspective view of the blank after certain operations have been performed thereon, and

Fig. 4 is a perspective view `of a completed spring.

It has been heretofore customary to form shuttle springs from ka single continuous strip of stock bent into the general form shown in Figs. l or 4C. When this stock was of uniform thickness throughout, the necessary resilience of the jaws could only be obtained by using a relatively thin stock which did not provide the necessary stiffness m the shank portion or the necessary thickness 1n the grooved portions. It was found necessary to increase the stiffness by the use of type of spring hereinafter de-` spreaders or filler pieces placed between the sides of the spring in the shank portion as the spring was assembled in the shuttle. This arrangement was more or less of a make-shift, involving the expense of manufacturing and yassembling a separate part, and the undesirable thinness of the grooved end portions was not remedied.v

In my improved spring, as shown in the drawings, I use a relatively thick piece of stock l0, as shown in Fig. 2, and while in the flat condition reduce the thickness of certain portions of the stock as shown at 11 and 12 in Fig. 3. The edges of the end portions may also be beveled as shown at 18 if so desired.

After the stock is thus prepared it is bent into the form shown in Fig. 4f in which the shank portion is of the unreduced thickness of the original stock while the portions intermediate the shank and the end portions are of reduced thicknessl and of correspondingly increased resilience. After the spring is thus shaped the grooves 14 are cut in the unreduced end portions. j

After the springs are tempered they are then ready to be assembled in the shuttle as shown in Fig. 1, no additional spreader or filler pieces being required.

I thus form a shuttle spring from a single 'piece of strip stock and by reducing the thickness of the stock in certain portions before bending l am enabled to provide relatively stiff portions and also relatively resilient portions positioned where needed in the finished spring.

Having thus described my invention, I do not wish to be limited to the precise details herein disclosed other than as set forth in the claims.

What l claim isl. As an article of manufacture, a shuttle spring formed of a single continuous strip of material, the shank and end portions of said spring being relatively thick and sti, and the remaining intermediate portions being of less thickness and of greater resili-A of material of uniform width, the shank and end vportions being of the full thickness of the stock, and the remaining intermediate rated points for loreasell resilience, and Portions, being reduc/@d in thickness, .t0 pQ- thorooftr bending the stockt@ the Shop@ 0f vde 1I1fcl1eased resilience.

Y y Y a Shuttle spring.- v f 10 3Q The process of making a s'lfmttl'e'springs?y In 'testimony whereof I have hereunto lwhch consists in taking a piece `6'St'ri'p"'HXedny signature.

stock of unfonm'wdth and 1 3kness,.1ce'" i ducng the'thckness of the stock et two sepa- 7 WILLIAM A. BASHAW.

Copies o! ythis patent 'may be ofotined for veientsa-eh, by addressing the Commissioner of Patents, l Washington, DQCJ y' I 

